Mac (Rob McElhenney) wears a Bellevue East Jazz Ensemble t-shirt in the “Mac and Dennis Buy A Time Share” episode of It’s Always Sunny in Philadelphia (Season 9, Episode 4). He also wears the shirt in Season 8, Episode 8.

Mac (Rob McElhenney) wears a Fall River Marskmen t-shirt in the “Flowers for Charlie” episode of It’s Always Sunny in Philadelphia (Season 9, Episode 8). He also wears the shirt in Season 6, Episode 4.

Mac (Rob McElhenney) wears a Detroit Express t-shirt in “The Gang Gives Frank an Intervention” episode of It’s Always Sunny in Philadelphia (Season 5, Episode 4). The Express were a professional soccer team that played in the old NASL from 1978 to 1980.

Mac (Rob McElhenney) wears a What Are You Looking At Dicknose t-shirt (the same one Stiles wears in the 1985 movie Teen Wolf) in the “Bums: Making A Mess All Over the City” episode of It’s Always Sunny in Philadelphia (Season 3, Episode 14).

Mac (Rob McElhenney) wears a Big Bone Lick State Park t-shirt in the “Frank Retires” episode of It’s Always Sunny in Philadelphia (Season 10, Episode 9). The state park is located in Kentucky near Cincinnati.

Mac (Rob McElhenney) wears a t-shirt that says Come to Philly for the Crack with an image of the Liberty Bell in the “Charlie Wants an Abortion” episode of It’s Always Sunny in Philadelphia (Season 1, Episode 2).